Question 1

Which statement best summarizes the cell theory as presented in modern biology?

Accepted Answer

All organisms are made of cells, and all cells arise from pre-existing cells.

Question 2

A scientist observes a cell under a microscope and notes the absence of a nucleus and membrane-bound organelles. Which domain does this cell most likely belong to?

Accepted Answer

Bacteria

Question 3

Why is the surface area to volume ratio important for cell function?

Accepted Answer

It affects the rate at which substances can enter or leave the cell.

Question 4

If a cell increases its size by a factor of $$r$$, by what factor does its surface area and volume increase?

Accepted Answer

Surface area increases by $$r^2$$ and volume by $$r^3$$

Question 5

Which of the following structures is found in all cells, both prokaryotic and eukaryotic?

Accepted Answer

Plasma membrane

Question 6

A cell is observed to have DNA in a region called the nucleoid, ribosomes, and a plasma membrane, but no internal membrane-bound organelles. What type of cell is this?

Accepted Answer

Prokaryotic cell

Question 7

Which organelle is responsible for synthesizing proteins that are exported from the cell?

Accepted Answer

Ribosomes bound to the rough endoplasmic reticulum

Question 8

A mutation disrupts the nuclear lamina in a eukaryotic cell. What is the most likely consequence?

Accepted Answer

Loss of nuclear shape and structural integrity

Question 9

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles.

Question 10

A freshwater protist is observed to have a contractile vacuole. What is the primary function of this organelle?

Accepted Answer

To pump excess water out of the cell

Question 11

Which of the following is a function of the smooth endoplasmic reticulum?

Accepted Answer

Lipid synthesis and detoxification of drugs

Question 12

During cellular respiration, which organelle is primarily responsible for converting chemical energy in food into ATP?

Accepted Answer

Mitochondrion

Question 13

Which structure is unique to plant cells and provides support, protection, and helps maintain cell shape?

Accepted Answer

Cell wall

Question 14

A cell is observed to have many ribosomes attached to its rough ER. What does this suggest about the cell's function?

Accepted Answer

It is actively producing proteins for export.

Question 15

Which of the following best explains why most cells are small?

Accepted Answer

Small cells have a higher surface area to volume ratio, facilitating efficient exchange of materials.

Question 16

Which equation correctly represents the calculation for the surface area of a cube with side length $$a$$?

Accepted Answer

$$6a^2$$

Question 17

Which organelle contains hydrolytic enzymes and is involved in the breakdown of macromolecules?

Accepted Answer

Lysosome

Question 18

A plant cell is observed to have a large central vacuole. What is the primary function of this organelle?

Accepted Answer

It stores water and organic compounds.

Question 19

Which of the following statements about mitochondria and chloroplasts is correct?

Accepted Answer

Mitochondria are the site of cellular respiration, while chloroplasts are the site of photosynthesis.

Question 20

Which cytoskeletal element is primarily responsible for the movement of cilia and flagella?

Accepted Answer

Microtubules

A Tour of the Cell: Structure, Function, and Diversity

Guida di studio - Domande di pratica

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